Tool-holder.



E. E. ELLIS.

TOOL HOLDER.

APPLICATION FILED 050.18, 1915.

Patented Mar. 27, 1917.

EMORY E. ELLIS, OF ORANGE, MASSACHUSETTS.

TOOL-HOLDER.

Specification of Letters Patent.

Patented Mar. 27, 1917.

Application filed December 18, 1915. Serial No. 67,686.

To all whom it may concern:

Be it known that I, EMORY E. Thus, a citizen of the United States, residing at Orange, county of Franklin, Commonwealth of Massachusetts, have invented certain new and useful Improvements in Tool-Holders, of which the following is a specification.

This invention relates to tool holders for use on lathes, planers, shapers, and other machines, and particuarly to a holder for a turning tool.

The present invention contemplates a tool holder which will rigidly lock the cutter or other tool in any of its three customary positions, straight, right, and left, of use. It has been proposed heretofore to provide a single holder which will accommodate a tool in these three positions. Such devices as are known to me, however, have all proven unsatisfactory in that the cutter was not clamped sufficiently tight to prevent its turning in use. Under the conditions of present day factory practice, the fast speed and heavy cuts under which these tools are required to operate, brings severe strain upon the tool and in a short time the tool develops sufficient play to increase the cut and gouge the work. As soon as this condition was reached and observed, it was sought to eliminate this destructive play by tightening the bolt which in these prior art constructions is supposed to hold the tool against movement. This tightening effect however usually had the result of either breaking the bolt under the pressure of the wrench or so weakening it as to break under a heavy cut when the tool was subjected to jar in use.

To the end therefore of providing an adjustable holder of this class, wherein all liability of the tool swinging laterally in use is eliminated and wherein the construction of the holder is materially simplified and lessened, I have devised my present inven tion. In it the head of the holder is so formed andcombined with a clamping device as to provide'stop shoulders on each side of the cutter or other tool and at each end thereof so that all tendency to turn is positively eliminated and a rigid socket construction secured.

The construction and operation of my device will be more fully disclosed in the specification which follows. In the drawings accompanying that specification I have shown as illustrative of the principles of my invention a form of holder which has proven satisfactory in use and well adapted to the requirements of manufacture. Throughout this specification and drawings, like reference numerals are correspondingly applied, and in these drawings:

Figure 1 is a partial elevation and partial sectional view of a tool holder in accordance with my invention.

Fig. 2 is an elevation thereof.

Fig. 3 is a plan View of the head of the holder with the lock nut removed, and

Fig. 4 is an underneath view in perspec tive of the clamping collar of my holder removed.

I have indicated at 1 the shank of a holder having an enlarged circular head 2 at one end. The head 2 has an axial bore 3 in which is rotatably mounted a tool post 4 having a shoulder 5 adapted to abut the under face of the head 2. The post 4 has a diametrical inclined slot 6 therein which is adapted to be registered with any of a series of six cutouts 7 formed in the top face of the head 2. The arrangement of the cutouts 7 provides with the slot 6 of the post 4 a series of three intersecting sockets in any of which a cutting bit or other tool may be rigidly clamped, thereby providing for maintaining the cutter in any of its three customary positions of use. In the embodiment shown, the three rear cutouts at the-rear of the head are deeper than the forward cutouts, and the bottoms of said cutouts and the slot 6 are themselves sloped upwardly so that the cut ter is positioned in upwardly pointed relation to the head 2. The cutout 7 in the longitudinal axis of the tool is extended rearwardly and downwardly as indicated at 9, Fig. l, and into the shank of the holder so as to receive cutters of varying lengths when clamped in their straight position of use or to permit adjustment of the cutter 8 shown.

The segmental portions of the head left between the cutouts 7 and indicated by the numeral 10 in the drawings act as stop shoulders against which both sides of the cutter 8 bear at each end thereof thereby preventing turning movement of the cutter in the holder.

The-cutter is held down in the cutouts 7 and the stud 4 held against accidental rotation by means of a locking collar 11 shown indetail in Fig. 4. This collar 11 has an internal shoulder 12 above an external shoulder 13 formed on the post 4 at the'base of the reduced threaded portion ll of said tool, and is locked on the post with a slight clearance between its under face and the top face of the head 2 by a lock nut 15 setup on the threaded portion 14: of the post. The collar 11 has on its under face a radial cutout 16 and oppositethereto a radially disposed depending lug 17. The exposed face of the lug 17 anl he bottom of the cutout 16 are formed as upwardly inclined surfaces in a common plane (see Fig. l) to conform to the inclination given the cutter S. The cutout 16 engages over the top face the cutter 8 near its cutting end with its two shoulders 16 engaging the bit on each side to lock it against turning movement. The inclined face of the lug 1T bears on the to; face of the cutter near its rear end with the side portions 17 of said lug abutting the walls of the cutout 7 receiving said rear end. The whole therefore provides a highly efficient clamp whereby the cutter is positively held against any tendency to swing in use.

It will therefore be seen that in my device the shoulders of the cutouts 7 at the sides of the cutter take all the side thrust and hold it near each end and positively prevent lateral swinging movement. The cutter may be clamped against vertical movement by simply setting up the nut on the bolt with a light strain. The bolt itself may be of fairly large size without impairing in any way the utility of the tool. Moreover, the tool may be. used to cut down both right and left hand shoulders without removal from the tool post or disturbing the work in the machine.

while I have shown and described a construction wherein the cutter is held in an upwardly pointed position, it will be understood that the holder may be modified-so as to position the cutter substantially parallel to the base.

Various modifications in the form and construction of my device may obviously be resorted to without departing from the spirit of my invention if within the limits of the appended claims.

hat I therefore claim and desire to secure by Letters Patent is:

1. A tool holder comprising a shank and an immovable head thereon having a bore therethrough and a plurality of diametrical recesses intersecting said bore, providing sockets to receive and embrace the tool on opposite sides and near each end thereof, a tool post rotatably mounted in said bore and having a tool receiving opening therethrough adapted to be registered with any of said recesses, and a member on said post having portions disposed on opposite sides of its under face and arranged for positioning over said recesses of the headto engage the tool near opposite ends thereof.

2. A tool holder comprising a shank with a body part having a bore therethrough and a plurality of recesses intersecting said bore, providing sockets to receive and embrace the tool on opposite sides and near each end thereof, a tool post rotatably mounted in said bore and having a tool receiving opening therethrough adapted to be registered with said recesses and a locking member surmounting said body and having a radial cutout and a depending lug on opposite sides of its under face disposed for positioning over any of said recesses of the head. to engage the tool near opposite endsthereof.

3. A tool holder comprising a shank having an immovable head, said head having a transverse bore therethrough and a plurality of radially arranged counter sunk recesses intersecting said bore, providing sockets to receive and embrace the tool on opposite sides and near each end thereof, a tool post rotatably mounted in said bore and having a tool receiving opening therethrongh adapted to be registered with any of said recesses, and a locking collar on said post surmounting said head and having a radial cutout and a depending lug on diametrically opposite sides of its under face disposed. for positioning over a pair of alined recesses of the head with the side walls of said cutout engaging the sides of the tool near one end and the sides of said lug abutting the side walls of the recess receiving the opposite end of the tool.

at. In a tool holder, a shank with a rigid head having a pair of diametrically opposite recesses, and a member having portions at diametrically opposite sides thereof disposed for clamping engagement with a tool held in said recesses, one of said portions entering a contiguous recess to interlock the head and said member.

5. In a tool holder, a shank with a rigid head, having a bore and a pair of opposite radial recesses intersecting the bore, and having inclined seating faces to dispose a tool obliquely to the axis of the bar, a tool post in said bore having a socket registrable with said recesses, and a member surmounting said head and having shoulders at opposite sides thereof disposed for locking engagement near each end of a tool held in said socket and recesses.

6. In a tool holder, a shank with a rigid head having a tool receiving socket, and a member having a recess and a depending lug for interlocking in said socket the side walls of the recess and the sides of the lug cooperating with said socket to look a tool mounted therein, whereby the said member is positively held against rotation relative to said head.

7. A holder for detachable cutting tools, comprising a shank adapted to be secured upon a'machine tool and having formed therein a series of tool receiving seats or sockets angularly disposed to each other and of a depth substantially equal to the thickness of the tool, and means for detachably securing the tool immovable in its seat upon the shank, the lateral or torsional pressure of the Work upon the tool being carried directly and Wholly by the acting Wall of a socket in the stock of the shank and the torsional strains being removed from the clamp by the Walls of the engaged recess.

8. A holder for detachable cutters comprising a shank having a series of tool receiving seats and in Which the resistance of the Work to the cutting process is taken Wholly by the engaged seat in the shank, and means interlocking with one of the seats in the shank for clamping the cutter in any one of the several seats in the shank.

9. A holder for detachable cutters comprising a shank having a series of diametrical, centrally intersecting cutter-receiving seats sunken in one end of the shank With their longitudinal axes oblique to an axial line through the head of the holder, whereby the lateral or torsional pressure of the Work '25 being cut is taken Wholly by the shank Copies of this patent may be obtained for five cents each, by addressing the stock, a rotatable clamp member having diametrically opposite inclined shoulders to rest upon the inserted cutter and adjustable to hold the cutter in any of the seats and With its axis oblique to the axis of the clamp seats, and a bolt extending transversely through the shank for securing said member and having a slot to admit the body of the cutter.

10. A tool holder for having a socket of a depth substantially equal to the thickness of the tool to be held whereby the resistance set up by the Work is taken Wholly by the Wall of the socket in the body of the tool-holder, means interlocking with the body of the holder for engaging and holding the tool in the socket, and a clamping device for acting upon the said means in any of its several positions.

In testimony whereof I afiix my signature in presence of tWo Witnesses.

EMORY E. ELLIS. l/Vitnesses:

HENRY A. WHITE, CARL E. ANDERSON.

Commissioner of Patents.

Washington, D. C.

detachable cutters, 

